The Chef's Choice professional knife sharpener has two stages to combine the strength and durability of the double-bevel edge with the flawless, ultra-sharp 15-degree edge technology to give your knives ultimate sharpness and effortless cutting ability. converts traditional 20-degree factory edges of European and American household knives into high performance 15-degree edges ideal for sharpening contemporary double-bevel and traditional single-bevel Asian-style knives sharpens both straight edge and serrated blades advanced spring guides provide accurate control of the sharpening angle and is easy to use 100% diamond abrasives for sharpening and honing-guaranteed to never detemper advanced flexible stropping/polishing disks for a super sharp, microscopically flawless polished edge AC. Plastic/steel. Measures 10.6x6.6x6.5H. Wipe clean with a damp cloth. Assembled in America of imported parts.